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/*-------------------------------------------------------------------------
*
* async.h
* Asynchronous notification: NOTIFY, LISTEN, UNLISTEN
*
* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/commands/async.h
*
*-------------------------------------------------------------------------
*/
#ifndef ASYNC_H
#define ASYNC_H
#include <signal.h>
#include "fmgr.h"
/*
* The number of SLRU page buffers we use for the notification queue.
*/
#define NUM_ASYNC_BUFFERS 8
extern bool Trace_notify;
extern volatile sig_atomic_t notifyInterruptPending;
extern Size AsyncShmemSize(void);
extern void AsyncShmemInit(void);
extern void NotifyMyFrontEnd(const char *channel,
const char *payload,
int32 srcPid);
/* notify-related SQL statements */
extern void Async_Notify(const char *channel, const char *payload);
extern void Async_Listen(const char *channel);
extern void Async_Unlisten(const char *channel);
extern void Async_UnlistenAll(void);
/* notify-related SQL functions */
extern Datum pg_listening_channels(PG_FUNCTION_ARGS);
extern Datum pg_notify(PG_FUNCTION_ARGS);
extern Datum pg_notification_queue_usage(PG_FUNCTION_ARGS);
/* perform (or cancel) outbound notify processing at transaction commit */
extern void PreCommit_Notify(void);
extern void AtCommit_Notify(void);
extern void AtAbort_Notify(void);
extern void AtSubStart_Notify(void);
extern void AtSubCommit_Notify(void);
extern void AtSubAbort_Notify(void);
extern void AtPrepare_Notify(void);
extern void ProcessCompletedNotifies(void);
/* signal handler for inbound notifies (PROCSIG_NOTIFY_INTERRUPT) */
extern void HandleNotifyInterrupt(void);
/* process interrupts */
extern void ProcessNotifyInterrupt(void);
#endif /* ASYNC_H */
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